CN117681950A - Limiting device, steer-by-wire system and vehicle - Google Patents

Abstract

The application discloses a stop device, steer-by-wire system and vehicle. The limiting device comprises a shell, a rotating shaft, a screw rod, a first limiter, a second limiter and a sliding part. The shell is internally provided with a limiting cavity. The rotating shaft is provided with a limiting shaft section, and the limiting shaft section at least partially penetrates through the limiting cavity. The lead screw is arranged at the periphery of the limiting shaft section. The first limiter and the second limiter are arranged on the limiting shaft section and are respectively positioned at two ends of the screw rod. The sliding part is arranged in the limiting cavity, is in sliding connection with the shell and is in threaded connection with the screw rod. The first limiter is provided with a first limiting part, the second limiter is provided with a second limiting part, a first abutting part is convexly arranged on one side, close to the first limiter, of the sliding part, and a second abutting part is convexly arranged on one side, close to the second limiter, of the sliding part. The sliding part enables the first abutting part to abut against the first limiting part or enables the second abutting part to abut against the second limiting part through movement. Through the mode, the rotary shaft can be limited to rotate excessively.

Description

Limiting device, steer-by-wire system and vehicle

Technical Field

The application relates to the technical field of vehicles, in particular to a limiting device, a steer-by-wire system and a vehicle.

Background

In the related art, a steering wheel module of a steering system and a steering machine are generally connected by a mechanical component such as a universal joint or a gear, and the steering wheel module and the steering machine can perform mechanical transmission. When the rotation angle of the steering wheel module of the steering system reaches the limit position, the allowable rotation angle of the steering machine structure can also reach the limit. In other words, in the extreme position, the steering engine itself may have a mechanical limiting effect. Mechanical limitation of the steering gear can be transmitted to the steering wheel module through mechanical transmission such as a universal joint or a gear, so that the steering wheel module can be limited. However, steer-by-wire systems eliminate the mechanical connection between the steering wheel module and the steering engine. The steering wheel module and the steering machine are connected by a local area network to transmit the rotation information of the steering wheel to the steering machine. This makes the mechanical restraint of the steering engine not transferable to the steering wheel module. When the steering system is controlled to steer, after the steering machine reaches the rotation limit position, the steering wheel can still continue to rotate because the mechanical limit cannot be transmitted to the steering wheel. This may result in excessive steering wheel rotation, which may result in the steering wheel module becoming disassociated with the steering engine, resulting in an increased driving risk factor.

Disclosure of Invention

Embodiments of the present application provide a stop device, steer-by-wire system and vehicle, can restrict the pivot from rotating excessively.

In a first aspect, embodiments of the present application provide a limiting device. The limiting device comprises a shell, a rotating shaft, a screw rod, a first limiter, a second limiter and a sliding part. The shell is internally provided with a limiting cavity. The rotating shaft is provided with a limiting shaft section, and the limiting shaft section at least partially penetrates through the limiting cavity. The lead screw is arranged at the periphery of the limiting shaft section. The first limiter is arranged on the limiting shaft section and is positioned at one end of the screw rod. The second limiter is arranged on the limiting shaft section and is positioned at the other end of the screw rod. The sliding part is arranged in the limiting cavity, is in sliding connection with the shell and is in threaded connection with the screw rod, so that the rotating shaft can drive the sliding part to move through rotation. The first limiter is provided with a first limiting part, the second limiter is provided with a second limiting part, a first abutting part is convexly arranged on one side, close to the first limiter, of the sliding part, and a second abutting part is convexly arranged on one side, close to the second limiter, of the sliding part. The sliding part enables the first abutting part to abut against the first limiting part or enables the second abutting part to abut against the second limiting part through movement.

In a second aspect, embodiments of the present application provide a steer-by-wire system. The steer-by-wire system comprises a steering wheel, a steering column and the limiting device. The steering wheel is connected with the steering column and is coaxially arranged, and the rotating shaft of the limiting device is connected with the steering column and is coaxially arranged.

In a third aspect, embodiments of the present application provide a vehicle. The vehicle comprises a frame, wheels and the steer-by-wire system. The steer-by-wire system is arranged on the frame and is in transmission connection with the wheels.

The beneficial effects of this application are: through set up the lead screw on the spacing axle section of pivot to set up in lead screw-thread fit's sliding part, make the rotation of pivot pass through the lead screw and transmit to sliding part. Since the sliding part is slidably connected with the housing, the rotation of the rotation shaft can be converted into the movement of the sliding part through the screw. The rotation of the rotating shaft can be anticlockwise rotation or clockwise rotation. When the rotating shaft rotates anticlockwise, the sliding part moves towards one end of the rotating shaft along the axial direction of the rotating shaft. When the rotating shaft rotates clockwise, the sliding part moves towards the other end of the rotating shaft along the axial direction of the rotating shaft. When the sliding part moves to the two ends of the screw rod along the axial direction of the rotating shaft, the first abutting part or the second abutting part of the sliding part can be abutted with the first limiting part of the first limiter or the second limiting part of the second limiter arranged at the two ends of the screw rod. When the first abutting part abuts against the first limiting part, the sliding part can not move towards the first limiting part any more due to the limitation of the first limiting part; when the second abutting part abuts against the second limiting part, the sliding part can not move towards the second limiting part due to the limitation of the second limiting part. After the sliding part can not move again, the screw rod can not rotate continuously because the sliding part is in threaded connection with the screw rod, and the rotating shaft can not rotate continuously. The rotating shaft can be limited by the clockwise or anticlockwise rotating angle, and the rotating shaft can be limited by the first limiter or the second limiter after rotating by a certain angle towards one direction, so that the rotating shaft is prevented from rotating excessively.

Drawings

FIG. 1 is a schematic structural view of a vehicle embodiment of the present application;

FIG. 2 is a schematic structural view of the steer-by-wire system of the present application;

FIG. 3 is a schematic view of the structure of the limiting device of the present application;

FIG. 4 is a detailed schematic view of an embodiment of the spacing device shown in FIG. 3;

FIG. 5 is a schematic view of an exploded view of the spacing device of FIG. 4;

FIG. 6 is a detailed schematic view of another embodiment of the spacing device shown in FIG. 3;

FIG. 7 is a schematic view of a partial structure of the spacing device of FIG. 6;

FIG. 8 is a schematic view of an embodiment of a sliding portion of the stop device shown in FIG. 3

FIG. 9 is a schematic view of another embodiment of a sliding portion of the stop device shown in FIG. 3;

FIG. 10 is a schematic view of an embodiment of the first stop and lead screw of FIG. 4;

FIG. 11 is a schematic view of an embodiment of the second stop of FIG. 4;

FIG. 12 is a schematic view of an embodiment of the first stop, second stop and lead screw of FIG. 7;

FIG. 13 is a schematic view of an embodiment of the first stop, second stop and lead screw of FIG. 4;

FIG. 14 is a schematic view of an embodiment of the first stop, second stop, lead screw and slider of FIG. 4;

FIG. 15 is a schematic view of an embodiment of the housing of FIG. 3;

fig. 16 is a schematic view of another embodiment of the housing of fig. 3.

Detailed Description

The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

Referring to fig. 1, an embodiment of a vehicle 1 of the present application includes a frame 20, wheels 30, and a steer-by-wire system 10. The steer-by-wire system 10 is disposed on the frame 20 and is in driving connection with the wheels 30. The wheels 30 may be mounted on the frame 20 via knuckles or spindles or the like, and then connected to the engine via the transmission system of the vehicle 1. The wheels 30 may include two steering wheels, and the steer-by-wire system 10 is capable of driving the two steering wheels to simultaneously perform steering motions under the operation of a driver or the instruction of an automatic driving system, thereby performing steering operation of the vehicle 1.

Referring to fig. 2, the steer-by-wire system 10 includes a steering wheel 11, a steering column 12, and a stop 100. The steering wheel 11 is connected to the steering column 12 and is coaxially disposed. The driver can input steering information such as a steering angle or a torque required for steering the vehicle 1 by controlling the steering wheel 11, and the information can be transmitted to the steering column 12. The limiting device 100 can limit the maximum angle through which the steering column 12 turns in one direction, thereby limiting the steering column 12 from turning too much, and thus limiting the steering wheel 11 from continuing to turn, reducing the situation in which the driver turns the steering wheel 11 too much.

The steer-by-wire system 10 also includes a steering sensor (not shown) and a steering engine (not shown). The steering sensor may be a rotation angle sensor or a torque sensor, etc. The steering column 12 may be connected to a steering sensor so that the steering sensor can detect parameters such as the rotation angle and the torque of the steering wheel 11 through the steering column 12. The steering engine is in driving connection with the wheels 30 of the vehicle 1 and in communication with the steering sensors. Steering information such as the steering angle and the torque detected by the steering sensor can be transmitted to the steering machine, and the steering machine can control the wheels 30 to perform steering motion based on the steering information. The steering gear or the wheels 30 may be provided with a travel sensor, such as a displacement sensor, a rotation angle sensor, or a displacement sensor. The driving sensors can detect the operating parameters of the wheels 30 or of the steering engine and can thus be transmitted to a central control system or other control elements of the vehicle 1.

The steer-by-wire system 10 further comprises a road-sensing motor 13 and a speed reducer 14, wherein the road-sensing motor 13 is in transmission connection with the speed reducer 14, and the speed reducer 14 is in transmission connection with the steering column 12. The speed reducer 14 is capable of changing the rotational speed and torque output from the road-sensing motor 13 so that the output from the road-sensing motor 13 can be adapted to the rotation of the steering column 12. The torque or other signal detected by the travel sensor can be transmitted to the road sensing motor 13. The road-sensing motor 13 can generate a corresponding torque according to road information such as torque received by the steering engine or wheels 30 on an actual road surface, and transmit the torque to the steering wheel 11 through the steering column 12, thereby enabling the driver to judge the actual road surface condition according to the magnitude of the turning torque of the steering wheel 11, and enabling the steering wheel 11 to adjust the turning angle according to the road information.

An exemplary description of the specific structure of the spacing device 100 is provided below.

Referring to fig. 3 to 5, the limiting device 100 includes a housing 120, a rotating shaft 110, a screw 130, a first limiter 140, a second limiter 150, and a sliding portion 160. The inside spacing cavity that has of casing 120, casing 120 can hold each part to can surround each part, thereby separate impurity such as outside dust of shelves, reduce inside each part and receive outside interference, increase the stability of work. The retarder 14 of the steer-by-wire system 10 has a housing, with the housing 120 of the stop device 100 being fixedly secured to the housing, e.g., detachably connected or integrally disposed. Specifically, the housing 120 may be provided with a flange, and the flange of the housing 120 and the outer shell of the reduction gear 14 may be coupled to each other by a fastener such as a bolt or a rivet. Or the housing 120 of the limiting device 100 and the housing of the reducer 14 may be integrally formed by casting or injection molding, which is not particularly limited.

The rotating shaft 110 has a limiting shaft section, and the limiting shaft section at least partially penetrates through the limiting cavity, and the rotating shaft 110 can rotate relative to the housing 120. The spindle 110 is connected to the steering column 12 of the steering system 10 and is coaxially disposed. The spacing shaft section can carry and mount the components of the lead screw 130, the first limiter 140, the second limiter 150, the sliding portion 160, and the like. The rotary shaft 110 may be connected to the steering column 12 of the steer-by-wire system 10 and coaxially disposed, and the rotary shaft 110 may be capable of rotating following the steering column 12 and the steering wheel 11. When the rotation of the rotary shaft 110 is restricted, the restriction can be transmitted to the steering wheel 11 through the steering column 12. Alternatively, the steering column 12 in the steer-by-wire system 10 and the spindle 110 in the stop 100 may be the same piece.

The lead screw 130 is arranged on the periphery of the limiting shaft section. The lead screw 130 can rotate along with the rotation shaft 110. The screw 130 may be integrally provided with the limiting shaft section, for example, a thread may be formed on the rotating shaft 110 by turning or the like. Or the lead screw 130 may be keyed to the spacing shaft section, such as by a flat key or spline, etc.

The first limiter 140 is disposed on the limiting shaft section and is located at one end of the screw 130. The second limiter 150 is disposed on the limiting shaft section and is located at the other end of the screw 130. The sliding portion 160 is disposed in the limiting cavity, slidably connected to the housing 120, and threadably connected to the screw 130, so that the rotating shaft 110 can rotate to drive the sliding portion 160 to move.

The stroke between the position of the sliding portion 160 when it abuts against the first stopper 140 and the position of the sliding portion 160 when it abuts against the second stopper 150 is the stroke of the sliding portion 160 on the screw 130. Optionally, the travel of the slider 160 on the lead screw 130 is less than the effective length of the threads on the lead screw 130. In this way, the sliding portion 160 does not move to the end of the thread length on the screw 130, and the situation that the torque required for rotating the rotating shaft 110 is increased due to the fact that the sliding portion 160 is too tightly screwed with the screw 130 can be effectively reduced.

In another embodiment, referring to fig. 6, 9 and 12, a first ball groove 131 is spirally provided on the screw 130. The sliding portion 160 is provided with a second ball groove 167 at an inner periphery thereof, and the second ball groove 167 cooperates with a part of the first ball groove 131 to form a ball passage (not shown). The stop device 100 further includes a ball return device 180, where the ball return device 180 has a ball return channel (not labeled) with one end of the ball return channel communicating with one end of the ball channel and the other end of the ball return channel communicating with the other end of the ball channel for circulation of the balls (shown in fig. 9, but not labeled) of the ball channel and the ball return channel. Wherein, as the sliding portion 160 moves along the screw 130, the portion of the first ball groove 131 engaged with the second ball groove 167 is continuously changed.

The ball passage formed by the screw 130 and the sliding portion 160 and the ball return passage of the ball return 180 allow the balls to roll in the ball passage and the ball return passage. The spindle 110 can drive the screw 130 to rotate in the rotating process, and the rotation of the screw 130 can promote the rolling of the balls. The rotation of the rotation shaft 110 can be converted into the movement of the sliding portion 160 as the balls roll in the ball passage and the ball return passage. The ball transmission method prevents the stroke of the sliding portion 160 from exceeding the length of the first ball groove 131 on the screw 130, and even when the sliding portion 160 abuts against the first stopper 140 or the second stopper 150, the ball transmission method does not easily block the relative movement of the sliding portion 160 and the screw 130. The ball transmission mode has higher accuracy, and can more precisely control the relation between the rotation angle of the rotating shaft 110 and the moving distance of the sliding part 160.

Further, on the basis of the above embodiment, the spindle 110 can drive the screw 130 to rotate, and the rotation of the spindle 110 can be converted into the movement of the sliding portion 160. The rotation shaft 110 may be rotated counterclockwise or clockwise. For example, when the rotating shaft 110 rotates in one direction, the sliding portion 160 is driven to move toward one of the first limiter 140 and the second limiter 150 along the axial direction of the rotating shaft 110. When the rotating shaft 110 rotates in the other direction, the sliding portion 160 is driven to move toward the other of the first limiter 140 and the second limiter 150 along the axial direction of the rotating shaft 110. The specific embodiment of the relationship between the rotation direction of the rotation shaft 110 and the movement direction of the sliding portion 160 may be determined by adjusting the rotation direction of the external screw thread of the screw 130 and the internal screw thread of the sliding portion 160, or the rotation direction of the first ball groove 131 and the second ball groove 167 according to specific designs.

When the rotating shaft 110 rotates clockwise, the sliding part 160 moves towards the first limiter 140; when the rotating shaft 110 rotates counterclockwise, the sliding portion 160 moves toward the second limiter 150, for example, to describe the embodiment of the present application, and the other embodiments are the same and will not be repeated.

When the rotation shaft 110 rotates clockwise, the sliding portion 160 moves toward the first stopper 140. When the sliding portion 160 abuts against the first stopper 140, the sliding portion 160 cannot move further in the direction of the first stopper 140, and movement of the sliding portion 160 is restricted. Since the sliding portion 160 is in driving connection with the lead screw 130, and the lead screw 130 and the rotating shaft 110 are coaxially rotated, after the movement of the sliding portion 160 is limited, the rotation of the rotating shaft 110 is also limited, that is, the movement of the sliding portion 160 toward the first limiter 140 reaches the limit position, and the clockwise rotation of the rotating shaft 110 reaches the limit position, at this time, the rotating shaft 110 cannot continue to rotate clockwise, but only can rotate anticlockwise. This can restrict the rotation shaft 110 from rotating excessively in the clockwise direction. When the rotation shaft 110 rotates counterclockwise, the sliding portion 160 moves toward the second stopper 150, and the sliding portion 160 can also restrict the excessive rotation of the rotation shaft 110 in the counterclockwise direction after abutting against the second stopper 150, in the same manner as the above-described restriction of the excessive rotation in the clockwise direction.

Specifically, referring to fig. 10 and 11, the first stopper 140 is provided with a first stopper portion 141, and the first stopper portion 141 has a first stopper surface 142. The second limiter 150 is provided with a second limiting portion 151 in a protruding manner, and the second limiting portion 151 has a second stop surface 152. The first limiting portion 141 protrudes from the first limiter 140 toward the sliding portion 160, and the second limiting portion 151 protrudes from the second limiter 150 toward the sliding portion 160.

Referring to fig. 8, a side of the sliding portion 160 near the first limiter 140 is provided with a first abutment portion 161 protruding toward the first limiter 140, and the first abutment portion 161 has a first abutment surface 163. The sliding portion 160 has a second abutment portion 162 protruding toward the second stopper 150 on a side thereof adjacent to the second stopper 150. The second abutment 162 has a second abutment surface 164. The sliding portion 160 moves to bring the first abutting portion 161 into abutment with the first stopper portion 141 or bring the second abutting portion 162 into abutment with the second stopper portion 151, so that the first abutting surface 163 is brought into abutment with the first stopper surface 142 or the second abutting surface 164 is brought into abutment with the second stopper surface 152.

Illustratively, the sliding portion 160 moves toward the first limiter 140: the rotation of the rotating shaft 110 drives the sliding portion 160 to move toward the first limiter 140. During the movement of the sliding portion 160, there is no interference between the first stopper portion 141 and the first abutment portion 161. As the sliding portion 160 moves continuously, the first stop surface 142 of the first limiting portion 141 and the first contact surface 163 of the first contact portion 161 contact each other, which interfere with each other, so that the sliding portion 160 cannot move continuously, and the rotating shaft 110 cannot rotate continuously. The first abutting portion 161 and the first limiting portion 141 are arranged, so that the sliding portion 160 and the first limiting device 140 do not need to directly abut through the end face, the sliding portion 160 and the first limiting device 140 can be arranged at intervals, the possibility that the sliding portion 160 moves to the end portion of the effective length of the thread on the screw rod 130 is reduced, and the possibility that the thread between the sliding portion 160 and the screw rod 130 is locked is reduced. The sliding portion 160 moves toward the second limiter 150 in the same manner, and will not be described again.

When the first abutting portion 161 abuts against the first limiting portion 141, the first abutting surface 163 and the first stop surface 142 are in surface contact with each other, so that the forces acting on the first abutting portion 161 and the first limiting portion 141 can be distributed relatively uniformly.

Further, when the rotation of the rotating shaft 110 is limited, the sliding portion 160 and the first limiter 140 are mainly subjected to torque, and the directions of the forces acting on the sliding portion 160 and the first limiter 140 are parallel to the tangential direction of the limiting shaft section. By arranging the normal directions of the first stop surface 142, the second stop surface 152, the first abutment surface 163, and the second abutment surface 164 in parallel with the tangential direction of the stopper shaft section at this point, the normal directions of the first stop surface 142 and the first abutment surface 163 can be made parallel with the stress direction of the sliding portion 160 and the first stopper 140. In this way, the bearing capacity of the first stop surface 142 and the first abutment surface 163 can be increased, which is beneficial to increasing the stability of limiting the rotation of the rotating shaft 110. The second abutment surface 164 and the second stop surface 152 are the same and will not be described again. Optionally, the axis of the rotating shaft 110 is located in the first stop surface 142 and the first abutment surface 163, that is, the abutment area when the first stop surface 142 abuts against the first abutment surface 163 can be maximized to further increase the stability during abutment.

In other embodiments, referring to fig. 7, when the movement of the sliding portion 160 toward the first stopper 140 reaches the limit position, the end surface of the sliding portion 160 toward the first stopper 140 abuts against the end surface of the first stopper 140 toward the sliding portion 160. When the movement of the sliding portion 160 toward the first stopper 140 reaches the limit position, the end surface of the sliding portion 160 toward the second stopper 150 abuts against the end surface of the second stopper 150 toward the sliding portion 160. By this arrangement, the structures of the sliding portion 160, the first stopper 140, and the second stopper 150 can be simplified, and the entire structure of the stopper device 100 can be assembled more compactly.

The following exemplary description of embodiments of the first stop 140, the second stop 150, and the lead screw 130 is provided:

in an embodiment, referring to fig. 10 to 12, the first limiter 140 is integrally disposed with the screw 130, the second limiter 150 is inserted into the screw 130, and the first limiter 140, the second limiter 150 and the screw 130 are sleeved on the outer circumference of the limiting shaft section. This can facilitate assembly of the lead screw 130, the first stopper 140, and the second stopper 150. Alternatively, the second limiter 150 may be integrally disposed with the screw 130, and the first limiter 140 may be inserted into the screw 130.

In another embodiment, referring to fig. 13, the first limiter 140 is inserted into one end of the screw 130, the second limiter 150 is inserted into the other end of the screw 130, and the first limiter 140, the second limiter 150 and the screw 130 are sleeved on the periphery of the limiting shaft section. Specifically, the first limiter 140 is provided with at least one first insertion hole 143, the second limiter 150 is provided with at least one second insertion hole 153, and both ends of the screw 130 are respectively provided with a first insertion portion 132 corresponding to the first insertion hole 143 and a second insertion portion 133 corresponding to the second insertion hole 153. The first plugging portion 132 is plugged into the first plugging hole 143, and the second plugging portion 133 is plugged into the second plugging hole 153, so as to connect the first limiter 140 and the second limiter 150 with the screw 130.

Further, two first plugging portions 132 are circumferentially spaced at one end of the screw 130, two second plugging portions 133 are circumferentially spaced at the other end of the screw 130, and an included angle is formed between a connecting line of the two first plugging portions 132 and a connecting line of the two second plugging portions 133. The two first plugging portions 132 and the two second plugging portions 133 can make the torque distribution between the screw 130 and the first limiter 140 and the second limiter 150 more uniform, which is beneficial to improving the stability of the whole structure. Alternatively, the connection lines of the two first plugging portions 132 and the connection lines of the two second plugging portions 133 are disposed vertically. So can make lead screw 130 and first stopper 140 and second stopper 150 produce the interact force when, the effort that produces can be at the axial interval distribution of lead screw 130 to make the atress of lead screw 130 comparatively even, thereby promote its structural stability.

In yet another embodiment, referring to fig. 14, the first limiter 140, the second limiter 150 and the screw 130 are integrally disposed, and the first limiter 140, the second limiter 150 and the screw 130 are sleeved on the outer circumference of the limiting shaft section. The sliding portion 160 includes a first sliding portion 160a and a second sliding portion 160b, which are respectively sleeved on the periphery of the screw 130 and are connected to each other.

In the above embodiment, the first stopper 140 and the second stopper 150 are coupled to the screw 130, so that the first stopper 140 and the second stopper 150 are rotated along with the rotation shaft 110. In this way, when the sliding portion 160 abuts against the first stopper 140, the sliding portion 160 cannot move, and the first stopper 140 cannot continue to rotate. The rotation of the rotation shaft 110 is restricted by the threaded engagement of the sliding portion 160 with the screw 130 on the one hand, and by the first stopper 140 transmitting a torque against the rotation to the screw 130 on the other hand, thereby enhancing the effect of restricting the excessive rotation of the rotation shaft 110.

In other embodiments, the first limiter 140 and the second limiter 150 may be installed on the housing 120 or integrally provided with the housing 120, where the first limiter 140 and the second limiter 150 are sleeved on the outer periphery of the limiting shaft section and are in clearance fit with the limiting shaft section. In other words, when the rotating shaft 110 rotates, the first limiter 140 and the second limiter 150 do not rotate along with the rotating shaft 110.

Referring to fig. 8, 15 and 16, in one embodiment, the sliding connection of the sliding portion 160 with the housing 120 may be as described in the following exemplary description.

The housing 120 is provided with a chute 121, the sliding portion 160 is provided with a slider 165, and the slider 165 is slidably engaged with the chute 121. The sliding groove 121 may be disposed through a side wall of the housing 120, or may be formed by bending a side wall of the housing 120, which is not particularly limited herein. The limiting device 100 further includes a bushing 166, where the bushing 166 is disposed between the sliding portion 160 and the inner wall of the housing 120, and is sleeved on the periphery of the slider 165. The bushing 166 can reduce friction between the slider 165 and the chute 121, thereby making sliding of the sliding portion 160 smoother, and also can reduce noise of the sliding portion 160 at the time of sliding.

Further, the housing 120 is provided with at least two sliding grooves 121, and the sliding grooves 121 are provided through the side wall of the housing 120. The sliding portion 160 is provided with at least two sliding blocks 165 slidably fitted with the sliding grooves 121. One of the sliding blocks 165 extends from one end of the outer periphery of the sliding portion 160 near the first stopper 140 to a first direction away from the axis of the rotating shaft 110, and the other sliding block 165 extends from one end of the outer periphery of the sliding portion 160 near the second stopper 150 to a second direction away from the first direction. Wherein the first direction and the second direction are parallel but opposite in orientation. By such arrangement, the slider 165 can be arranged to be spaced from each other to provide a space for mounting the bead returning device 180, thereby facilitating the mounting of the bead returning device 180.

Referring to fig. 16, at least two sliding grooves 121 extend from one end of the housing 120 near the first limiter 140 along the axial direction of the rotating shaft 110 toward the first limiter 140 toward the second limiter 150, and the extending length of one sliding groove 121 is shorter than that of the other sliding groove 121. In this manner, the slide block 165 having a different position can be simultaneously brought into contact with the end wall of the chute 121 when the slide portion 160 moves toward the second stopper 150. When the slider 165 abuts against the end wall of the chute 121, the sliding portion 160 abuts against the second limiter 150, so that the end wall of the chute 121 and the second limiter 150 can simultaneously limit the sliding of the sliding portion 160. The ends of the two sliding grooves 121 near the first stopper 140 may be flush, or the sliding portion 160 may be disengaged from the ends of the two sliding grooves 121 near the first stopper 140.

Referring to fig. 4 and 5, the limiting device 100 further includes a fastener 170, and the fastener 170 may be a nut, a clip, or the like, which is not limited in particular. The fastener 170 is sleeved on the rotating shaft 110 and is located at one end of the second limiter 150 away from the first limiter 140, so as to limit the movement of the first limiter 140, the second limiter 150 and the screw 130 relative to the rotating shaft 110. This reduces axial play of the various components and increases the stability of the stop device 100 in limiting rotation.

In summary, the screw 130 is disposed on the limiting shaft section of the rotating shaft 110 and is disposed on the sliding portion 160 in threaded engagement with the screw 130, so that the rotation of the rotating shaft 110 can be transmitted to the sliding portion 160 through the screw 130. Since the sliding portion 160 is slidably coupled with the housing 120, the rotation of the rotation shaft 110 can be converted into the movement of the sliding portion 160 by the screw 130. Or the ball passage formed by the screw 130 and the sliding part 160 and the ball return passage of the ball return device 180 allow the balls to roll in the ball passage and the ball return passage. The rotation shaft 110 can drive the screw 130 to rotate in the rotation process, and the rotation of the screw 130 can promote the balls to roll, so that the rotation of the rotation shaft 110 can be transmitted to the sliding part 160. Since the sliding portion 160 is slidably coupled with the housing 120, the rotation of the rotation shaft 110 can be converted into the movement of the sliding portion 160.

The rotation of the rotation shaft 110 may be counterclockwise or clockwise. When the rotating shaft 110 rotates counterclockwise, the sliding portion 160 moves toward one end of the rotating shaft 110 in the axial direction of the rotating shaft 110. When the rotation shaft 110 rotates clockwise, the sliding portion 160 moves toward the other end of the rotation shaft 110 along the axial direction of the rotation shaft 110. When the sliding portion 160 moves to both ends of the screw 130 along the axial direction of the rotation shaft 110, the first abutting portion 161 or the second abutting portion 162 of the sliding portion 160 can abut against the first limiting portion 141 of the first limiter 140 or the second limiting portion 151 of the second limiter 150 provided at both ends of the screw 130. When the first abutting portion 161 abuts against the first limiting portion 141, the sliding portion 160 is not able to move further toward the first limiter 140 due to the limitation of the first limiter 140; when the second abutting portion 162 abuts against the second limiting portion 151, the sliding portion 160 cannot move further toward the second limiter 150 due to the limitation of the second limiter 150. When the sliding portion 160 is not movable, the sliding portion 160 is in driving connection with the screw 130, so that the screw 130 cannot be rotated further, and the rotation shaft 110 cannot be rotated further. By this arrangement, the clockwise or counterclockwise rotation angle of the rotating shaft 110 can be limited, so that the rotating shaft 110 can be limited by the first limiter 140 or the second limiter 150 after rotating by a certain angle towards one direction, thereby limiting the excessive rotation of the rotating shaft 110.

The foregoing is only examples of the present application, and is not intended to limit the scope of the patent application, and all equivalent structures or equivalent processes using the descriptions and the contents of the present application or other related technical fields are included in the scope of the patent application.

Claims (14)

1. A spacing device, comprising:

the shell is internally provided with a limiting cavity;

the rotating shaft is provided with a limiting shaft section, and the limiting shaft section at least partially penetrates through the limiting cavity;

the screw rod is arranged on the periphery of the limiting shaft section;

the first limiter is arranged on the limiting shaft section and is positioned at one end of the screw rod;

the second limiter is arranged on the limiting shaft section and is positioned at the other end of the lead screw;

the sliding part is arranged in the limiting cavity, is in sliding connection with the shell and is in threaded connection with the lead screw, so that the rotating shaft can drive the sliding part to move through rotation;

the first limiter is provided with a first limiting part, the second limiter is provided with a second limiting part, a first abutting part is convexly arranged on one side, close to the first limiter, of the sliding part, and a second abutting part is convexly arranged on one side, close to the second limiter, of the sliding part; the sliding portion moves to enable the first abutting portion to abut against the first limiting portion or enable the second abutting portion to abut against the second limiting portion.

2. The spacing device of claim 1, wherein:

the first limiting part is convexly provided with a first stop surface; the second limiting part is convexly provided with a second stop surface; the first abutting part is provided with a first abutting surface, and the second abutting part is provided with a second abutting surface; the sliding portion moves to bring the first abutment surface into abutment with the first stop surface or bring the second abutment surface into abutment with the second stop surface.

3. A spacing device according to claim 2, characterized in that:

the normal directions of the first stop surface, the second stop surface, the first abutting surface and the second abutting surface are parallel to the tangential direction of the limiting shaft section.

4. The spacing device of claim 1, wherein:

the first limiter is integrally arranged with the screw rod, the second limiter is inserted into the screw rod, and the first limiter, the second limiter and the screw rod are sleeved on the periphery of the limiting shaft section.

5. The spacing device of claim 1, wherein:

the first limiter is inserted into one end of the screw rod, the second limiter is inserted into the other end of the screw rod, and the first limiter, the second limiter and the screw rod are sleeved on the periphery of the limiting shaft section.

6. The spacing device of claim 5, wherein:

the first limiter is provided with at least one first inserting hole, the second limiter is provided with at least one second inserting hole, and two ends of the lead screw are respectively provided with a first inserting part corresponding to the first inserting hole and a second inserting part corresponding to the second inserting hole; the first plug-in connection part is inserted into the first plug-in connection hole, and the second plug-in connection part is inserted into the second plug-in connection hole.

7. The spacing device of claim 6, wherein:

one end of the screw rod is circumferentially provided with two first plug-in parts at intervals, the other end of the screw rod is circumferentially provided with two second plug-in parts at intervals, and the connecting line of the two first plug-in parts and the connecting line of the two second plug-in parts are arranged at an included angle.

8. The spacing device of claim 1, wherein:

the first limiter, the second limiter and the screw rod are integrally arranged, and the first limiter, the second limiter and the screw rod are sleeved on the periphery of the limiting shaft section; the sliding part comprises a first sliding part and a second sliding part which are respectively sleeved on the periphery of the screw rod and are connected with each other.

9. The spacing device of claim 1, wherein:

the shell is provided with a chute, the sliding part is provided with a sliding block, and the sliding block is in sliding fit with the chute; the limiting device further comprises a bushing, wherein the bushing is arranged between the sliding part and the inner wall of the shell, and is sleeved on the periphery of the sliding block.

10. The spacing device of claim 1, wherein:

the travel of the sliding part on the screw rod is smaller than the effective length of the threads on the screw rod.

11. The spacing device of claim 1, wherein:

the screw rod is integrally arranged with the limiting shaft section, or the screw rod is in key connection with the limiting shaft section, the limiting device further comprises a fastener, the fastener is sleeved on the rotating shaft and is positioned at one end, far away from the first limiter, of the second limiter, and the first limiter, the second limiter and the screw rod move relative to the rotating shaft.

12. A steer-by-wire system, comprising:

a spacing device as claimed in any one of claims 1 to 11;

a steering wheel;

the steering column is connected with the steering column and is coaxially arranged, and the rotating shaft of the limiting device is connected with the steering column and is coaxially arranged.

13. The steer-by-wire system of claim 12, wherein:

the steering-by-wire system also comprises a road-sensing motor and a speed reducer, wherein the road-sensing motor is in transmission connection with the speed reducer, and the speed reducer is in transmission connection with the steering column or the rotating shaft; the speed reducer is provided with a shell, and the shell of the limiting device is detachably connected with or integrally arranged with the shell.

14. A vehicle, characterized by comprising:

a frame, wheels and a steer-by-wire system as claimed in claim 13, which is arranged on the frame and is in driving connection with the wheels.